text: #ifndef _LINUX_BINFMTS_H
  #define _LINUX_BINFMTS_H
  
  #include <linux/capability.h>
  
  struct pt_regs;
  
  /*
   * These are the maximum length and maximum number of strings passed to the
   * execve() system call.  MAX_ARG_STRLEN is essentially random but serves to
   * prevent the kernel from being unduly impacted by misaddressed pointers.
   * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
   */
  #define MAX_ARG_STRLEN (PAGE_SIZE * 32)
  #define MAX_ARG_STRINGS 0x7FFFFFFF
  
  /* sizeof(linux_binprm->buf) */
  #define BINPRM_BUF_SIZE 128
  
  #ifdef __KERNEL__
  
  #define CORENAME_MAX_SIZE 128
  
  /*
   * This structure is used to hold the arguments that are used when loading binaries.
   */
  struct linux_binprm{
  	char buf[BINPRM_BUF_SIZE];
  #ifdef CONFIG_MMU
  	struct vm_area_struct *vma;
  #else
  # define MAX_ARG_PAGES	32
  	struct page *page[MAX_ARG_PAGES];
  #endif
  	struct mm_struct *mm;
  	unsigned long p; /* current top of mem */
  	int sh_bang;
  	struct file * file;
  	int e_uid, e_gid;
  	kernel_cap_t cap_inheritable, cap_permitted;
  	bool cap_effective;
  	void *security;
  	int argc, envc;
  	char * filename;	/* Name of binary as seen by procps */
  	char * interp;		/* Name of the binary really executed. Most
  				   of the time same as filename, but could be
  				   different for binfmt_{misc,script} */
  	unsigned interp_flags;
  	unsigned interp_data;
  	unsigned long loader, exec;
  	unsigned long argv_len;
  };
  
  #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
  #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
  
  /* fd of the binary should be passed to the interpreter */
  #define BINPRM_FLAGS_EXECFD_BIT 1
  #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
  
  
  /*
   * This structure defines the functions that are used to load the binary formats that
   * linux accepts.
   */
  struct linux_binfmt {
  	struct list_head lh;
  	struct module *module;
  	int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
  	int (*load_shlib)(struct file *);
  	int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
  	unsigned long min_coredump;	/* minimal dump size */
  	int hasvdso;
  };
  
  extern int register_binfmt(struct linux_binfmt *);
  extern void unregister_binfmt(struct linux_binfmt *);
  
  extern int prepare_binprm(struct linux_binprm *);
  extern int __must_check remove_arg_zero(struct linux_binprm *);
  extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
  extern int flush_old_exec(struct linux_binprm * bprm);
  
  extern int suid_dumpable;
  #define SUID_DUMP_DISABLE	0	/* No setuid dumping */
  #define SUID_DUMP_USER		1	/* Dump as user of process */
  #define SUID_DUMP_ROOT		2	/* Dump as root */
  
  /* Stack area protections */
  #define EXSTACK_DEFAULT   0	/* Whatever the arch defaults to */
  #define EXSTACK_DISABLE_X 1	/* Disable executable stacks */
  #define EXSTACK_ENABLE_X  2	/* Enable executable stacks */
  
  extern int setup_arg_pages(struct linux_binprm * bprm,
  			   unsigned long stack_top,
  			   int executable_stack);
  extern int bprm_mm_init(struct linux_binprm *bprm);
  extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
  extern void compute_creds(struct linux_binprm *binprm);
  extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
  extern int set_binfmt(struct linux_binfmt *new);
  
  #endif /* __KERNEL__ */
  #endif /* _LINUX_BINFMTS_H */
  